fkie_cve-2025-68216
Vulnerability from fkie_nvd
Published
2025-12-16 14:15
Modified
2025-12-18 15:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Disable trampoline for kernel module function trace The current LoongArch BPF trampoline implementation is incompatible with tracing functions in kernel modules. This causes several severe and user-visible problems: * The `bpf_selftests/module_attach` test fails consistently. * Kernel lockup when a BPF program is attached to a module function [1]. * Critical kernel modules like WireGuard experience traffic disruption when their functions are traced with fentry [2]. Given the severity and the potential for other unknown side-effects, it is safest to disable the feature entirely for now. This patch prevents the BPF subsystem from allowing trampoline attachments to kernel module functions on LoongArch. This is a temporary mitigation until the core issues in the trampoline code for kernel module handling can be identified and fixed. [root@fedora bpf]# ./test_progs -a module_attach -v bpf_testmod.ko is already unloaded. Loading bpf_testmod.ko... Successfully loaded bpf_testmod.ko. test_module_attach:PASS:skel_open 0 nsec test_module_attach:PASS:set_attach_target 0 nsec test_module_attach:PASS:set_attach_target_explicit 0 nsec test_module_attach:PASS:skel_load 0 nsec libbpf: prog 'handle_fentry': failed to attach: -ENOTSUPP libbpf: prog 'handle_fentry': failed to auto-attach: -ENOTSUPP test_module_attach:FAIL:skel_attach skeleton attach failed: -524 Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED Successfully unloaded bpf_testmod.ko. [1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/ [2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44eb3849378be5f72b8be03edbacbdcd6f5eade4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/677e6123e3d24adaa252697dc89740f2ac07664e
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Disable trampoline for kernel module function trace\n\nThe current LoongArch BPF trampoline implementation is incompatible\nwith tracing functions in kernel modules. This causes several severe\nand user-visible problems:\n\n* The `bpf_selftests/module_attach` test fails consistently.\n* Kernel lockup when a BPF program is attached to a module function [1].\n* Critical kernel modules like WireGuard experience traffic disruption\n  when their functions are traced with fentry [2].\n\nGiven the severity and the potential for other unknown side-effects, it\nis safest to disable the feature entirely for now. This patch prevents\nthe BPF subsystem from allowing trampoline attachments to kernel module\nfunctions on LoongArch.\n\nThis is a temporary mitigation until the core issues in the trampoline\ncode for kernel module handling can be identified and fixed.\n\n[root@fedora bpf]# ./test_progs -a module_attach -v\nbpf_testmod.ko is already unloaded.\nLoading bpf_testmod.ko...\nSuccessfully loaded bpf_testmod.ko.\ntest_module_attach:PASS:skel_open 0 nsec\ntest_module_attach:PASS:set_attach_target 0 nsec\ntest_module_attach:PASS:set_attach_target_explicit 0 nsec\ntest_module_attach:PASS:skel_load 0 nsec\nlibbpf: prog \u0027handle_fentry\u0027: failed to attach: -ENOTSUPP\nlibbpf: prog \u0027handle_fentry\u0027: failed to auto-attach: -ENOTSUPP\ntest_module_attach:FAIL:skel_attach skeleton attach failed: -524\nSummary: 0/0 PASSED, 0 SKIPPED, 1 FAILED\nSuccessfully unloaded bpf_testmod.ko.\n\n[1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/\n[2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/"
    }
  ],
  "id": "CVE-2025-68216",
  "lastModified": "2025-12-18T15:08:06.237",
  "metrics": {},
  "published": "2025-12-16T14:15:54.627",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44eb3849378be5f72b8be03edbacbdcd6f5eade4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/677e6123e3d24adaa252697dc89740f2ac07664e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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